US20100278667A1 - Peristaltic Pump - Google Patents
Peristaltic Pump Download PDFInfo
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- US20100278667A1 US20100278667A1 US12/434,066 US43406609A US2010278667A1 US 20100278667 A1 US20100278667 A1 US 20100278667A1 US 43406609 A US43406609 A US 43406609A US 2010278667 A1 US2010278667 A1 US 2010278667A1
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- Prior art keywords
- gear
- pair
- pump mechanism
- compartment
- occlusion
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
- F04B43/1253—Machines, pumps, or pumping installations having flexible working members having peristaltic action by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing
- F04B43/1261—Machines, pumps, or pumping installations having flexible working members having peristaltic action by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing the rollers being placed at the outside of the tubular flexible member
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/17—Cleaning arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/08—Machines, pumps, or pumping installations having flexible working members having tubular flexible members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
- F04B43/1253—Machines, pumps, or pumping installations having flexible working members having peristaltic action by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing
- F04B43/1269—Machines, pumps, or pumping installations having flexible working members having peristaltic action by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing the rotary axes of the rollers lying in a plane perpendicular to the rotary axis of the driving motor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
- F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
Definitions
- the present disclosure relates to peristaltic pumps.
- the illustrated embodiments are directed to a maintenance system for an imaging machine in which the maintenance system utilizes a peristaltic pump to transfer fluids.
- moving surfaces are used to transfer images onto a substrate.
- nozzles on a printhead eject an ink image onto an intermediate transfer surface, such as a rotating transfer drum.
- a final receiving surface or substrate is brought into contact with the intermediate drum so that the ink image is transferred onto the substrate.
- a fluid release agent is then brought into contact with the intermediate transfer surface or drum to prepare the surface for the next image transfer.
- a maintenance unit is provided that is operable to clean the transfer surface(s) of the machine.
- One such maintenance system is described in pending U.S. patent application Ser. No. 11/315,178, published as No. 2007/0146461, the disclosure of which is incorporated herein by reference.
- one embodiment disclosed in this application includes a drum maintenance unit (DMU) 10 that is operable to clean and restore the transfer surface S of an intermediate drum D, as illustrated in FIG. 1 .
- DMU drum maintenance unit
- the DMU 10 includes an applicator assembly 12 that applies one or more fluid agents to the surface S and that simultaneously scrapes debris and pixels from the surface.
- the applicator assembly draws a release agent from a reservoir 16 to apply the surface S with a felt roller and meters the quantity of release agent with a metering blade.
- the applicator assembly 12 may also include a separate blade that pre-cleans the drum surface S of debris and un-transferred pixels. The debris and excess fluid are collected and the recaptured fluid C is transferred to a collection reservoir 14 .
- the collected fluid is drawn by a pump 20 through a filter 18 that removes larger debris.
- the reclaimed fluid R is returned to the reservoir 16 for reuse by the applicator assembly 12 .
- the DMU 10 shown in FIG. 1 is representative of devices that require self-priming pumps capable of moving solid and semi-solid particles with a fluid.
- the pump 20 may be called upon to transfer fluid to multiple reservoirs within the printing machine.
- the DMU also preferably evolves to a modular self-contained unit that can be periodically discarded and replaced.
- the DMU, and more particularly the fluid circuit within the DMU must remain sealed and leak free during shipping, storage and handling during installation.
- the size of the DMU Miniaturization of the pump within the DMU can be problematic since the smaller pump must be capable of the same duty cycle as its larger predecessor.
- a peristaltic pump mechanism comprises a first gear having teeth configured for meshed engagement with a drive source, such as a DC motor and a first pair of occlusion members configured to compress a first transport tube against an occlusion surface.
- a drive source such as a DC motor
- a first pair of occlusion members configured to compress a first transport tube against an occlusion surface.
- Each occlusion member is mounted on an axle, with one end of the axle mounted on the first gear and an opposite end of each axle engaged by a support member.
- Two support ribs are mounted between the gear and the support element.
- the pair of occlusion members includes a first pair of rollers mounted on the gear 180° apart from each other.
- the two support ribs are mounted on the gear 180° apart from each other and offset 90° from the pair of rollers.
- the DC motor drives a worm gear in meshed engagement with the gear of the pump mechanism.
- the peristaltic pump mechanism includes a second gear having teeth configured for meshed engagement with a drive source and a second pair of occlusion members configured to compress a second transport tube against an occlusion surface.
- Each of the second occlusion members is mounted on a second axle having one end mounted on the second gear and an opposite end mounted on the first gear.
- the first pair of occlusion members include a first pair of rollers mounted on the first gear 180° apart from each other, while the second pair of occlusion members are a second pair of rollers mounted on the second gear 180° apart from each other and 90° offset from the first pair of rollers.
- a peristaltic pump comprises a housing defining a pump mechanism compartment and an occlusion surface and a pump mechanism disposed for rotation within the compartment.
- the pump mechanism includes a pair of gears and a pair of occlusion members mounted between the gears.
- a transport tube is disposed within the compartment between the occlusion surface and the occlusion members of the pump mechanism.
- the pump further comprises a motor and an output gear rotatably driven by the motor.
- An idler assembly is rotatably driven by the output gear, the idler assembly including a first idler gear in meshed engagement with one of the gears, a second idler gear in meshed engagement with the other gear and a shaft connecting the idler gears.
- a peristaltic pump in another embodiment comprises a housing defining a pump mechanism compartment and an occlusion surface within the compartment, a peristaltic pump mechanism disposed for rotation within the compartment and including a pair of occlusion members, a transport tube disposed within the compartment between the occlusion surface and the occlusion members, and a drive member coupled to the pump mechanism to rotate the mechanism within the compartment.
- the housing includes a lower housing and a cap mounted thereon the lower housing, in which the lower housing and the cap define a pair of tube retention channels to receive inlet and outlet ends of the transport tube when the tube is disposed within the pump mechanism compartment.
- the lower housing and the cap define alternating teeth projecting into the tube retention channel to engage the transport tube therein when the cap is mounted on the lower housing.
- a kit for assembling a single channel or a dual channel peristaltic pump comprising a pair of identically configured pump mechanisms, each including a gear having teeth configured for meshed engagement with a drive source, a pair of occlusion members configured to compress a transport tube against an occlusion surface, and a pair of support ribs mounted on the gear between the occlusion members.
- a support plate engages the axles of the occlusion members of one of the pump mechanisms.
- the kit further includes a pair of transport tubes, each configured to be disposed between an occlusion surface and the occlusion members, and a pair of lower housings each defining a pump mechanism compartment.
- the compartment of one of the lower housings is sized to receive one of the pump mechanisms and the support plate, while the compartment of the other of the lower housings is sized to receive the pair of pump mechanisms and the support plate stacked on top of each other.
- a cap is provided that is engageable to either of the pair of lower housings to enclose the pump mechanism compartment.
- the kit further includes a drive member coupled to the gear of at least one of the pair of pump mechanisms disposed within the pump mechanism compartment for rotating the pump mechanism.
- FIG. 1 is a representation of a drum maintenance unit with fluid reclamation features.
- FIG. 2 is a perspective view of a single channel peristaltic pump mechanism according to one embodiment disclosed herein.
- FIG. 3 is a perspective view of a dual channel peristaltic pump mechanism according to a further embodiment disclosed herein.
- FIG. 4 is a top perspective view of a single channel peristaltic pump mechanism according to another embodiment disclosed herein, shown with the mechanism mounted within a lower housing.
- FIG. 5 is a top perspective view of a single channel peristaltic pump according to another embodiment disclosed herein.
- FIG. 6 is a top elevational view of the pump shown in FIG. 5 .
- FIG. 7 is an enlarged cross-sectional view of a tube retention feature of the pump shown in FIGS. 5-6 .
- FIG. 8 is an exploded view of components of a single channel peristaltic pump according to one disclosed embodiment.
- FIG. 9 is an exploded view of components of a dual channel peristaltic pump according to another disclosed embodiment.
- FIG. 10 is an enlarged view of a portion of the assembled dual channel peristaltic pump shown in FIG. 9 .
- a peristaltic pump mechanism 30 is provided in a compact modular package, as shown in FIG. 2 , and combines high flow-to-volume and flow-to-cost ratios with the ability to pump fluids with solid contaminants. As described herein, this pump mechanism can be utilized for the pump 20 in the drum maintenance unit 10 depicted in FIG. 1 . However, it is understood that the embodiments described herein may be used in other machines and devices to deliver a variety of fluids.
- the pump mechanism shown in FIG. 2 is a single channel embodiment, meaning that a single tube, such as tube 64 shown in FIG. 4 , passes through the mechanism for transporting a single fluid therethrough.
- the pump mechanism includes a gear 32 that is rotated by a drive source.
- the conventional peristaltic pump is typically provided with three or more rollers spaced at even angular intervals to ensure occlusion and sealing of the transport tube.
- the multiple rollers are supported on a carriage articulated through a central post.
- the peristaltic pump mechanism 30 disclosed herein relies upon a pair of occlusion members 34 , offset by 180°, that are configured to compress the transport tube in a known manner.
- the rollers are carried by an axle 38 which is supported on a roller mount 36 that is integral with the gear.
- the roller mounts may be configured with a bearing recess, such as the recesses 71 , which receive the roller axles 72 shown in FIG. 4 .
- the occlusion members 34 are preferably rollers rotatably mounted on the axle 38 or rotatable with the axle 38 relative to the gear 32 .
- the three or more rollers are mounted within a carriage and the carriage is driven by way of a central shaft.
- the central shaft is driven by the power source.
- the gear 32 is driven while also functioning as the carriage for supporting the peristaltic rollers 34 .
- the power transmission to the pump mechanism is direct. This configuration also eliminates the structure found in conventional pumps for supporting the central shaft.
- the rollers operate within an occlusion surface that extends through more than 180° of the gear rotation.
- the occlusion surface 63 of the lower housing 62 supports the tube 64 past the 180° point of the gear rotation.
- the occlusion surface 63 merges tangentially into the side wall surfaces 68 that hold the tube 64 in a U-shaped configuration to ensure that the rollers maintain contact with the tube beyond the 180° rotation point.
- the use of three or more rollers provides structural stability and strength to the carriage and pump.
- this strength and stability is supplied by a pair of support ribs 42 that are attached at one end to the gear 32 , as seen in FIG. 2 .
- the support ribs 42 are diametrically opposite each other and are offset 90° from the rollers 34 .
- the ribs can be contoured as shown in FIG. 2 to fit tightly in the space between the rollers, thereby reducing the overall dimensions of the pump mechanism 30 relative to conventional peristaltic pump designs.
- the outer surface 42 a may extend generally parallel to and immediately adjacent, but inside, a tangent line between the two rollers 34 .
- the inner surface 42 b may be triangular or frustum-shaped and contoured to substantially follow the curvature of the cylindrical rollers in the space between the rollers.
- the pump mechanism further includes a support plate 40 that is mounted on the support ribs.
- the support plate defines axle bores 41 ( FIG. 3 ) to receive the roller axles 38 .
- the support ribs 42 are attached to the support plate 40 with alignment posts 43 that are received within mating bores (not shown) in the plate.
- An attachment pin 46 may extend through the plate 40 into a mating recess 44 in the support rib, as shown in FIGS. 2-3 .
- a similar mating arrangement can be incorporated into the attachment of the ribs to the gear.
- an engagement screw 75 as shown in FIG. 4 , may be used to fix the support rib to the support plate 40 and/or the gear.
- the ribs 42 may be integrally formed with either the gear 36 or the support plate 40 .
- the mating arrangements may be permanently affixed, such as by sonic welding or by an adhesive, or may be semi-permanently affixed, such as by press-fit or interference-fit engagement.
- the pump mechanism is configured as a single channel pump.
- one pair of rollers is provided to engage a single tube.
- the pump mechanism 50 is configured as a dual channel pump.
- two sets of rollers 34 are provided to engage a pair of tubes.
- the components of the pump mechanism 30 shown in FIG. 2 are designed for modularity to permit assembly of a single or a multiple channel pump by adding like components to the assembly. It can be seen in FIG. 3 that the lower channel 51 of the pump mechanism 50 includes the same components as the upper channel 52 , namely the gear 32 , rollers 34 and support ribs 42 .
- the upper channel 52 is capped with the support plate 40 in the same manner as in the single channel pump mechanism 30 .
- the underside of the gear 32 is configured to mate with the roller axles 38 and the interface elements 34 and 46 of the support ribs.
- the underside of each gear 32 and the underside of the support plate 40 are similarly configured.
- gear can be identically configured on both faces to enhance the modularity of the components.
- the rollers 34 of the lower channel 51 are offset 90° from the rollers of the upper channel 52 .
- the torque load in a peristaltic pump can fluctuate as the rollers engage and disengage the transport tube.
- the carriage supporting the rollers i.e., the gears, support ribs and support plate
- the rollers 34 of the lower channel 51 are offset 90° from the rollers of the upper channel 52 , as seen in FIG. 3 .
- the rollers in the lower channel 51 are 90° out of phase relative to the rollers of the upper channel 52 .
- rollers results in a peak torque load that is about half of the load for rollers that are in phase.
- the power requirements for driving a dual channel pump is unchanged by the roller orientation, the reduction in peak torque leads to a reduction in peak current demand for the motor.
- Lower peak current allows the use of a smaller motor.
- the out of phase positioning of the rollers minimizes the amplitude of the torque fluctuations which in turn decreases the cyclic load experienced by the pump mechanism. Decreasing the cyclic load improves the fatigue life of the pump 50 .
- the support plate 40 includes a mounting hub 48 .
- This mounting hub is configured to mate with a corresponding recess defined in the housing containing the pump mechanisms 30 , 50 .
- the recess is defined in the caps 103 , 103 ′ shown in FIGS. 8-9 .
- the gears may include a similar mounting hub, such as the hub 74 on the gear 67 shown in FIG. 4 , for engagement with a corresponding recess in the lower housing, such as lower housings 102 , 102 ′ in FIGS. 8-9 . It is contemplated that a hub 74 may be incorporated into both sides of the gear 32 ( FIG. 2) and 66 , 67 ( FIG. 4 ) to mate with corresponding recesses in the upper and lower portions of the housing.
- the mounting hub 48 is configured to provide a bearing surface for rotation of the pump mechanism within the housing.
- the dual channel pump mechanism 50 is well-suited for certain DMU systems where the subject fluid is transported to two different locations.
- the fluid agent is delivered to two locations along the length of an applicator.
- this two location delivery is accomplished by a T-fitting on the output of a single channel pump.
- the addition of a fluid fitting increases the risk of leakage.
- the fluid flow through each branch of the T-fitting was not uniform, either due to downstream pressure differences or concentration of debris in one branch.
- the dual channel capability of the pump mechanism 50 provides two distinct isolated outputs so that substantially the same fluid flow is seen at both locations of the DMU applicator.
- the modularity of the pump components permits a pump construction as shown in FIG. 4 in which a single channel pump 60 is provided with a single pair of rollers 70 but includes two gears 66 , 67 .
- the dual gears of the dual channel pump 50 of FIG. 3 and the single channel pump 70 of FIG. 4 permits a novel drive mechanism for rotating the gears.
- a motor 80 is carried by a motor mount 81 that is attached to, or alternatively integral with, the lower housing 62 that contains the pump mechanism.
- a transmission 82 connects the output shaft (not shown) of the motor to the two gears 66 , 67 .
- the transmission 82 includes a pinion gear 84 fastened to the motor output shaft.
- the pinion gear meshes with a lower idler gear 86 that is connected to an upper idler gear 87 by a shaft 88 .
- the lower idler gear 86 is in meshed engagement with the lower gear 66 while the upper idler gear 87 meshes with the upper gear 67 .
- the two idler gears thus drive both gears, thereby eliminating the torsional bending that can occur when just the lower gear is driven. Since both gears 66 , 67 are driven at the same rotational speed, via the idler gears 86 / 87 , the rollers 70 will maintain a steady uniform pressure on the transport tube 64 during peristaltic operation.
- the pinion gear can mesh with a separate gear in the middle of the shaft 88 to equalize possible torsional deflections between the two idler gears 86 / 87 .
- a further benefit provided by the disclosed peristaltic pumps is that the pump mechanism is compact and assumes a much smaller envelop than known pumps. Integrating the rotational drive directly into the carriage supporting the rollers 34 , 70 helps in this miniaturization of the pump.
- the gears 66 , 67 and transmission 82 of the embodiment in FIG. 4 provide a compact drive mechanism for the peristaltic rollers.
- a further reduction in pump size can be accomplished as shown in FIGS. 5-6 .
- a pump 100 includes the motor 80 mounted within the motor compartment 104 of a lower housing 102 .
- a pump mechanism compartment 106 contains the pump mechanism, which is shown in FIG. 4 as the single channel mechanism 30 of FIG. 2 .
- the gear 32 of the pump mechanism is driven by a lead screw or worm gear 90 extending from or forming part of the motor drive shaft.
- the lower housing defines a bearing slot 108 that supports the free end of the worm gear 90 .
- the slot may include a bearing or bushing, or may be formed of a bearing-type material, such as a Delrin® plastic or similar material. It can be noted from FIGS. 5 and 8 that the bearing slot 108 is open in the lower housing 102 to facilitate assembly of the pump 100 .
- the motor may be a small DC brush motor connected to an external power supply and control system.
- the motor control system may use pulse width modulation to control the rotational speed to thereby control the flow rate and avoid over-heating.
- the motor 20 in the DMU 10 shown in FIG. 1 the motor is operable to deliver an average total flow rate of 2.20 mL/min/channel.
- the gear ratio between the worm gear 90 and the gear 32 is 48:1.
- the miniaturization of the pump mechanism as disclosed herein can actually increase the flow rate capacity of a given motor.
- the driving gear is a worm gear that is oriented generally perpendicular to the pump compartment 106 of the lower housing 102 . It should be understood that other angular orientations of the worm gear relative to the pump compartment may be contemplated, including a configuration in which the worm gear 90 extends generally parallel to the longitudinal axis of the compartment. In this configuration the motor compartment 104 would be generally aligned with the pump compartment, instead of at the right angle orientation shown in FIG. 6 .
- the packaging of the motor, worm gear and pump mechanism can be determined by the size and shape of the space within which the pump is to reside.
- the power transmission from motor 80 to gear 32 is through the worm gear 90 .
- This approach provides the benefit of substantial tooth engagement between the gears, as seen in FIG. 6 .
- the transmission interface between the motor and pump mechanism may incorporate other gear configurations such as a spur, helical or bevel gear arrangement.
- the motor is dropped into the motor compartment 104 with the worm gear 90 residing in the slot.
- the pump mechanism 30 including the tube 64 wrapped around the rollers 34 , may then be dropped into the compartment 106 of the lower housing 102 with the gear 32 meshed with the worm gear 90 and the U-shaped tube disposed over the worm gear.
- the lid 103 engages the lower housing 102 to complete the assembly.
- the interior of the lower housing and lid define recesses to rotationally support the mounting hub 48 of the support plate 40 , and optionally the hub 74 of the gear.
- the housing and lid may be configured for snap or interlocking engagement, such as the notch 125 and latch 126 shown in FIG. 8 .
- FIG. 9 Assembly of a dual channel pump is depicted in FIG. 9 .
- the lower housing 102 ′ is deeper than the lower housing 102 of the single channel pump in FIG. 8 to accommodate the two pump mechanisms 30 .
- the bearing slot 108 ′ is shallower than the slot 108 in the single channel embodiment.
- the lowermost pump mechanism is disposed beneath the worm gear 90
- the uppermost mechanism 30 is disposed above the worm gear, as shown in FIG. 9 .
- the positioning of the transport tubes is illustrated in FIG. 10 .
- the lower tube passes through lower tube retention channels 110 while the upper tube passes through the upper retention channels 120 . It can be appreciated from FIG.
- the retention channels are defined at the interface between the lower housing 102 ′ and the lid 103 ′. Consequently, the lower retention channels 110 are offset inward from the upper channels 120 .
- the lower housing 102 ′ defines a central window 118 that receives a central flange 119 of the lid 103 ′.
- the lower retention channels are thus defined at the interface between the window 118 and the flange 119 .
- the upper channels 120 are defined at the interface between the upper edge 121 of the lower housing 102 ′ and the body 122 of the lid 103 ′.
- fitting are required to engage the transport tube(s) to hold them in position within the housing while the rollers apply pressure to the tube(s). While these fittings are adept at holding the tube position they inherently increase the risk of leakage.
- the fitting-to-tube interface becomes a collection point for debris entrained within the fluid flow. Consequently, while conventional peristaltic pumps are well-suited to moving “dirty” fluids, they are susceptible to becoming clogged, particularly on the suction side of the transport tube. The clogs also increase the risk of fluid leak at the fitting. Consequently, in the pump assemblies disclosed herein, no fittings are required due to the configuration of the tube retention channels 110 , 120 . In the exemplary configuration shown in FIG.
- the lower housing 102 ′ defines a retention tooth 112 flanked by a pair of recesses 113 .
- the lid 103 ′ defines a recess 116 flanked by a pair of teeth 115 .
- the recesses and teeth are alternating or complementary meaning that the tooth 112 directly opposes the recess 116 , and the recesses 113 directly oppose the upper teeth 115 .
- the teeth 112 and 115 are configured to project slightly into the corresponding retention channel 110 , 120 . The teeth thus compress and slightly bend the tube 64 at the retention channel so that the tube bows slightly upward into the upper recess 116 and downward slightly into the lower recesses 113 . This configuration prevents the tube from crawling out of the pump housing under the rotating pressure of the rollers.
- the components of the peristaltic pumps and pump mechanisms disclosed herein are formed of materials suitable for fluid transport.
- the components forming the carriages in the different embodiments namely the gears, support ribs and support plates, can be formed of a suitable plastic.
- the rollers may be of conventional design and formed of a hard plastic or rubber material.
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Abstract
Description
- The present disclosure relates to peristaltic pumps. The illustrated embodiments are directed to a maintenance system for an imaging machine in which the maintenance system utilizes a peristaltic pump to transfer fluids.
- In an imaging machine such as an inkjet printing system, moving surfaces are used to transfer images onto a substrate. In inkjet systems, nozzles on a printhead eject an ink image onto an intermediate transfer surface, such as a rotating transfer drum. A final receiving surface or substrate is brought into contact with the intermediate drum so that the ink image is transferred onto the substrate. A fluid release agent is then brought into contact with the intermediate transfer surface or drum to prepare the surface for the next image transfer.
- Over time, the intermediate transfer surface may accumulate un-transferred pixels and debris that can diminish print quality. Left unchecked, this extraneous material can render a transfer drum unacceptable, requiring replacement of the drum. However, in some imaging or printing machines, a maintenance unit is provided that is operable to clean the transfer surface(s) of the machine. One such maintenance system is described in pending U.S. patent application Ser. No. 11/315,178, published as No. 2007/0146461, the disclosure of which is incorporated herein by reference. In general terms, one embodiment disclosed in this application includes a drum maintenance unit (DMU) 10 that is operable to clean and restore the transfer surface S of an intermediate drum D, as illustrated in
FIG. 1 . TheDMU 10 includes anapplicator assembly 12 that applies one or more fluid agents to the surface S and that simultaneously scrapes debris and pixels from the surface. In one embodiment, the applicator assembly draws a release agent from areservoir 16 to apply the surface S with a felt roller and meters the quantity of release agent with a metering blade. Theapplicator assembly 12 may also include a separate blade that pre-cleans the drum surface S of debris and un-transferred pixels. The debris and excess fluid are collected and the recaptured fluid C is transferred to acollection reservoir 14. The collected fluid is drawn by apump 20 through afilter 18 that removes larger debris. The reclaimed fluid R is returned to thereservoir 16 for reuse by theapplicator assembly 12. - The
DMU 10 shown inFIG. 1 is representative of devices that require self-priming pumps capable of moving solid and semi-solid particles with a fluid. In some systems, thepump 20 may be called upon to transfer fluid to multiple reservoirs within the printing machine. - Moreover, as printing machine designs become increasingly modular, the DMU also preferably evolves to a modular self-contained unit that can be periodically discarded and replaced. In this case, the DMU, and more particularly the fluid circuit within the DMU must remain sealed and leak free during shipping, storage and handling during installation. Finally, as printing machines become smaller, so too must the size of the DMU. Miniaturization of the pump within the DMU can be problematic since the smaller pump must be capable of the same duty cycle as its larger predecessor.
- A peristaltic pump mechanism comprises a first gear having teeth configured for meshed engagement with a drive source, such as a DC motor and a first pair of occlusion members configured to compress a first transport tube against an occlusion surface. Each occlusion member is mounted on an axle, with one end of the axle mounted on the first gear and an opposite end of each axle engaged by a support member. Two support ribs are mounted between the gear and the support element. The pair of occlusion members includes a first pair of rollers mounted on the gear 180° apart from each other. The two support ribs are mounted on the gear 180° apart from each other and offset 90° from the pair of rollers. The DC motor drives a worm gear in meshed engagement with the gear of the pump mechanism.
- In one embodiment, the peristaltic pump mechanism includes a second gear having teeth configured for meshed engagement with a drive source and a second pair of occlusion members configured to compress a second transport tube against an occlusion surface. Each of the second occlusion members is mounted on a second axle having one end mounted on the second gear and an opposite end mounted on the first gear. The first pair of occlusion members include a first pair of rollers mounted on the first gear 180° apart from each other, while the second pair of occlusion members are a second pair of rollers mounted on the second gear 180° apart from each other and 90° offset from the first pair of rollers.
- In a further embodiment, a peristaltic pump comprises a housing defining a pump mechanism compartment and an occlusion surface and a pump mechanism disposed for rotation within the compartment. The pump mechanism includes a pair of gears and a pair of occlusion members mounted between the gears. A transport tube is disposed within the compartment between the occlusion surface and the occlusion members of the pump mechanism. The pump further comprises a motor and an output gear rotatably driven by the motor. An idler assembly is rotatably driven by the output gear, the idler assembly including a first idler gear in meshed engagement with one of the gears, a second idler gear in meshed engagement with the other gear and a shaft connecting the idler gears.
- A peristaltic pump in another embodiment comprises a housing defining a pump mechanism compartment and an occlusion surface within the compartment, a peristaltic pump mechanism disposed for rotation within the compartment and including a pair of occlusion members, a transport tube disposed within the compartment between the occlusion surface and the occlusion members, and a drive member coupled to the pump mechanism to rotate the mechanism within the compartment. The housing includes a lower housing and a cap mounted thereon the lower housing, in which the lower housing and the cap define a pair of tube retention channels to receive inlet and outlet ends of the transport tube when the tube is disposed within the pump mechanism compartment. The lower housing and the cap define alternating teeth projecting into the tube retention channel to engage the transport tube therein when the cap is mounted on the lower housing.
- A kit is provided in another embodiment for assembling a single channel or a dual channel peristaltic pump comprising a pair of identically configured pump mechanisms, each including a gear having teeth configured for meshed engagement with a drive source, a pair of occlusion members configured to compress a transport tube against an occlusion surface, and a pair of support ribs mounted on the gear between the occlusion members. A support plate engages the axles of the occlusion members of one of the pump mechanisms. The kit further includes a pair of transport tubes, each configured to be disposed between an occlusion surface and the occlusion members, and a pair of lower housings each defining a pump mechanism compartment. The compartment of one of the lower housings is sized to receive one of the pump mechanisms and the support plate, while the compartment of the other of the lower housings is sized to receive the pair of pump mechanisms and the support plate stacked on top of each other. A cap is provided that is engageable to either of the pair of lower housings to enclose the pump mechanism compartment. The kit further includes a drive member coupled to the gear of at least one of the pair of pump mechanisms disposed within the pump mechanism compartment for rotating the pump mechanism.
-
FIG. 1 is a representation of a drum maintenance unit with fluid reclamation features. -
FIG. 2 is a perspective view of a single channel peristaltic pump mechanism according to one embodiment disclosed herein. -
FIG. 3 is a perspective view of a dual channel peristaltic pump mechanism according to a further embodiment disclosed herein. -
FIG. 4 is a top perspective view of a single channel peristaltic pump mechanism according to another embodiment disclosed herein, shown with the mechanism mounted within a lower housing. -
FIG. 5 is a top perspective view of a single channel peristaltic pump according to another embodiment disclosed herein. -
FIG. 6 is a top elevational view of the pump shown inFIG. 5 . -
FIG. 7 is an enlarged cross-sectional view of a tube retention feature of the pump shown inFIGS. 5-6 . -
FIG. 8 is an exploded view of components of a single channel peristaltic pump according to one disclosed embodiment. -
FIG. 9 is an exploded view of components of a dual channel peristaltic pump according to another disclosed embodiment. -
FIG. 10 is an enlarged view of a portion of the assembled dual channel peristaltic pump shown inFIG. 9 . - A
peristaltic pump mechanism 30 is provided in a compact modular package, as shown inFIG. 2 , and combines high flow-to-volume and flow-to-cost ratios with the ability to pump fluids with solid contaminants. As described herein, this pump mechanism can be utilized for thepump 20 in thedrum maintenance unit 10 depicted inFIG. 1 . However, it is understood that the embodiments described herein may be used in other machines and devices to deliver a variety of fluids. - The pump mechanism shown in
FIG. 2 is a single channel embodiment, meaning that a single tube, such astube 64 shown inFIG. 4 , passes through the mechanism for transporting a single fluid therethrough. The pump mechanism includes agear 32 that is rotated by a drive source. The conventional peristaltic pump is typically provided with three or more rollers spaced at even angular intervals to ensure occlusion and sealing of the transport tube. The multiple rollers are supported on a carriage articulated through a central post. In order to reduce the space requirement from the package size required for the conventional pump, theperistaltic pump mechanism 30 disclosed herein relies upon a pair ofocclusion members 34, offset by 180°, that are configured to compress the transport tube in a known manner. The rollers are carried by anaxle 38 which is supported on aroller mount 36 that is integral with the gear. The roller mounts may be configured with a bearing recess, such as therecesses 71, which receive theroller axles 72 shown inFIG. 4 . Theocclusion members 34 are preferably rollers rotatably mounted on theaxle 38 or rotatable with theaxle 38 relative to thegear 32. - In conventional peristaltic pumps, the three or more rollers are mounted within a carriage and the carriage is driven by way of a central shaft. The central shaft is driven by the power source. In order to decrease the overall size of the
pump mechanism 30, thegear 32 is driven while also functioning as the carriage for supporting theperistaltic rollers 34. The power transmission to the pump mechanism is direct. This configuration also eliminates the structure found in conventional pumps for supporting the central shaft. - In order to avoid any occlusion problems, the rollers operate within an occlusion surface that extends through more than 180° of the gear rotation. Thus, as depicted in
FIG. 4 , theocclusion surface 63 of thelower housing 62 supports thetube 64 past the 180° point of the gear rotation. Theocclusion surface 63 merges tangentially into the side wall surfaces 68 that hold thetube 64 in a U-shaped configuration to ensure that the rollers maintain contact with the tube beyond the 180° rotation point. - In the conventional peristaltic pump designs, the use of three or more rollers provides structural stability and strength to the carriage and pump. In the
pump 30 this strength and stability is supplied by a pair ofsupport ribs 42 that are attached at one end to thegear 32, as seen inFIG. 2 . Thesupport ribs 42 are diametrically opposite each other and are offset 90° from therollers 34. The ribs can be contoured as shown inFIG. 2 to fit tightly in the space between the rollers, thereby reducing the overall dimensions of thepump mechanism 30 relative to conventional peristaltic pump designs. Thus, the outer surface 42 a may extend generally parallel to and immediately adjacent, but inside, a tangent line between the tworollers 34. The inner surface 42 b may be triangular or frustum-shaped and contoured to substantially follow the curvature of the cylindrical rollers in the space between the rollers. - The pump mechanism further includes a
support plate 40 that is mounted on the support ribs. The support plate defines axle bores 41 (FIG. 3 ) to receive theroller axles 38. Thesupport ribs 42 are attached to thesupport plate 40 withalignment posts 43 that are received within mating bores (not shown) in the plate. Anattachment pin 46 may extend through theplate 40 into amating recess 44 in the support rib, as shown inFIGS. 2-3 . A similar mating arrangement can be incorporated into the attachment of the ribs to the gear. In lieu of the pin, an engagement screw 75, as shown inFIG. 4 , may be used to fix the support rib to thesupport plate 40 and/or the gear. Alternatively, theribs 42 may be integrally formed with either thegear 36 or thesupport plate 40. When the pump mechanism is assembled—i.e., when therollers 34 have been mounted on the gear—the mating arrangements may be permanently affixed, such as by sonic welding or by an adhesive, or may be semi-permanently affixed, such as by press-fit or interference-fit engagement. - In the embodiment illustrated in
FIG. 2 , the pump mechanism is configured as a single channel pump. Thus, one pair of rollers is provided to engage a single tube. In the embodiment shown inFIG. 3 , thepump mechanism 50 is configured as a dual channel pump. In this embodiment, two sets ofrollers 34 are provided to engage a pair of tubes. The components of thepump mechanism 30 shown inFIG. 2 are designed for modularity to permit assembly of a single or a multiple channel pump by adding like components to the assembly. It can be seen inFIG. 3 that thelower channel 51 of thepump mechanism 50 includes the same components as theupper channel 52, namely thegear 32,rollers 34 andsupport ribs 42. Theupper channel 52 is capped with thesupport plate 40 in the same manner as in the singlechannel pump mechanism 30. - As part of this modularity, the underside of the
gear 32 is configured to mate with theroller axles 38 and theinterface elements gear 32 and the underside of thesupport plate 40 are similarly configured. It is further contemplated that gear can be identically configured on both faces to enhance the modularity of the components. - As seen in
FIG. 3 , therollers 34 of thelower channel 51 are offset 90° from the rollers of theupper channel 52. It is known that the torque load in a peristaltic pump can fluctuate as the rollers engage and disengage the transport tube. In order to minimize the peak torque demand for the motor driving the dual channel pump, the carriage supporting the rollers (i.e., the gears, support ribs and support plate) are configured so that therollers 34 of thelower channel 51 are offset 90° from the rollers of theupper channel 52, as seen inFIG. 3 . In other words, the rollers in thelower channel 51 are 90° out of phase relative to the rollers of theupper channel 52. This arrangement of rollers results in a peak torque load that is about half of the load for rollers that are in phase. Although the power requirements for driving a dual channel pump is unchanged by the roller orientation, the reduction in peak torque leads to a reduction in peak current demand for the motor. Lower peak current allows the use of a smaller motor. It can also be noted that the out of phase positioning of the rollers minimizes the amplitude of the torque fluctuations which in turn decreases the cyclic load experienced by the pump mechanism. Decreasing the cyclic load improves the fatigue life of thepump 50. - As shown in
FIG. 3 , thesupport plate 40 includes a mountinghub 48. This mounting hub is configured to mate with a corresponding recess defined in the housing containing thepump mechanisms caps FIGS. 8-9 . The gears may include a similar mounting hub, such as thehub 74 on thegear 67 shown inFIG. 4 , for engagement with a corresponding recess in the lower housing, such aslower housings FIGS. 8-9 . It is contemplated that ahub 74 may be incorporated into both sides of the gear 32 (FIG. 2) and 66 , 67 (FIG. 4 ) to mate with corresponding recesses in the upper and lower portions of the housing. The mountinghub 48 is configured to provide a bearing surface for rotation of the pump mechanism within the housing. - The dual
channel pump mechanism 50 is well-suited for certain DMU systems where the subject fluid is transported to two different locations. In some DMUs the fluid agent is delivered to two locations along the length of an applicator. In prior systems this two location delivery is accomplished by a T-fitting on the output of a single channel pump. The addition of a fluid fitting increases the risk of leakage. Moreover, the fluid flow through each branch of the T-fitting was not uniform, either due to downstream pressure differences or concentration of debris in one branch. The dual channel capability of thepump mechanism 50 provides two distinct isolated outputs so that substantially the same fluid flow is seen at both locations of the DMU applicator. - The modularity of the pump components permits a pump construction as shown in
FIG. 4 in which a single channel pump 60 is provided with a single pair ofrollers 70 but includes twogears dual channel pump 50 ofFIG. 3 and thesingle channel pump 70 ofFIG. 4 permits a novel drive mechanism for rotating the gears. As shown inFIG. 4 , amotor 80 is carried by amotor mount 81 that is attached to, or alternatively integral with, thelower housing 62 that contains the pump mechanism. Atransmission 82 connects the output shaft (not shown) of the motor to the twogears transmission 82 includes apinion gear 84 fastened to the motor output shaft. The pinion gear meshes with alower idler gear 86 that is connected to anupper idler gear 87 by ashaft 88. Thelower idler gear 86 is in meshed engagement with thelower gear 66 while theupper idler gear 87 meshes with theupper gear 67. The two idler gears thus drive both gears, thereby eliminating the torsional bending that can occur when just the lower gear is driven. Since bothgears rollers 70 will maintain a steady uniform pressure on thetransport tube 64 during peristaltic operation. In an alternative configuration, the pinion gear can mesh with a separate gear in the middle of theshaft 88 to equalize possible torsional deflections between the twoidler gears 86/87. - A further benefit provided by the disclosed peristaltic pumps is that the pump mechanism is compact and assumes a much smaller envelop than known pumps. Integrating the rotational drive directly into the carriage supporting the
rollers gears transmission 82 of the embodiment inFIG. 4 provide a compact drive mechanism for the peristaltic rollers. A further reduction in pump size can be accomplished as shown inFIGS. 5-6 . In this embodiment, apump 100 includes themotor 80 mounted within themotor compartment 104 of alower housing 102. Apump mechanism compartment 106 contains the pump mechanism, which is shown inFIG. 4 as thesingle channel mechanism 30 ofFIG. 2 . Thegear 32 of the pump mechanism is driven by a lead screw orworm gear 90 extending from or forming part of the motor drive shaft. The lower housing defines abearing slot 108 that supports the free end of theworm gear 90. The slot may include a bearing or bushing, or may be formed of a bearing-type material, such as a Delrin® plastic or similar material. It can be noted fromFIGS. 5 and 8 that thebearing slot 108 is open in thelower housing 102 to facilitate assembly of thepump 100. - The motor may be a small DC brush motor connected to an external power supply and control system. Depending upon the application, the motor control system may use pulse width modulation to control the rotational speed to thereby control the flow rate and avoid over-heating. In one specific application for use as the
motor 20 in theDMU 10 shown inFIG. 1 , the motor is operable to deliver an average total flow rate of 2.20 mL/min/channel. In this specific embodiment, the gear ratio between theworm gear 90 and thegear 32 is 48:1. - It has been discovered that the miniaturization of the pump mechanism as disclosed herein can actually increase the flow rate capacity of a given motor. In the disclosed embodiments, the carriage supporting the rollers—or more specifically the
gear 32,support ribs 42 andsupport plate 40—can have a smaller diameter than conventional peristaltic pumps. This reduced diameter reduces the moment arm of the torque load on the carriage. Reduction of the torque load allows the DC motor to run at a higher speed, which may even result in an increase in flow rate depending on the stall torque of the motor. - In the embodiment shown in
FIGS. 5-10 the driving gear is a worm gear that is oriented generally perpendicular to thepump compartment 106 of thelower housing 102. It should be understood that other angular orientations of the worm gear relative to the pump compartment may be contemplated, including a configuration in which theworm gear 90 extends generally parallel to the longitudinal axis of the compartment. In this configuration themotor compartment 104 would be generally aligned with the pump compartment, instead of at the right angle orientation shown inFIG. 6 . The packaging of the motor, worm gear and pump mechanism can be determined by the size and shape of the space within which the pump is to reside. - In the illustrated embodiment, the power transmission from
motor 80 to gear 32 is through theworm gear 90. This approach provides the benefit of substantial tooth engagement between the gears, as seen inFIG. 6 . In alternative embodiments, the transmission interface between the motor and pump mechanism may incorporate other gear configurations such as a spur, helical or bevel gear arrangement. - In one manner of assembly, illustrated in
FIG. 8 , the motor is dropped into themotor compartment 104 with theworm gear 90 residing in the slot. Thepump mechanism 30, including thetube 64 wrapped around therollers 34, may then be dropped into thecompartment 106 of thelower housing 102 with thegear 32 meshed with theworm gear 90 and the U-shaped tube disposed over the worm gear. Thelid 103 engages thelower housing 102 to complete the assembly. As explained above, the interior of the lower housing and lid define recesses to rotationally support the mountinghub 48 of thesupport plate 40, and optionally thehub 74 of the gear. The housing and lid may be configured for snap or interlocking engagement, such as thenotch 125 and latch 126 shown inFIG. 8 . - Assembly of a dual channel pump is depicted in
FIG. 9 . In this embodiment, thelower housing 102′ is deeper than thelower housing 102 of the single channel pump inFIG. 8 to accommodate the twopump mechanisms 30. In addition, thebearing slot 108′ is shallower than theslot 108 in the single channel embodiment. In the dual channel embodiment, the lowermost pump mechanism is disposed beneath theworm gear 90, while theuppermost mechanism 30 is disposed above the worm gear, as shown inFIG. 9 . The positioning of the transport tubes is illustrated inFIG. 10 . In particular, the lower tube passes through lowertube retention channels 110 while the upper tube passes through theupper retention channels 120. It can be appreciated fromFIG. 10 that the retention channels are defined at the interface between thelower housing 102′ and thelid 103′. Consequently, thelower retention channels 110 are offset inward from theupper channels 120. Thelower housing 102′ defines acentral window 118 that receives a central flange 119 of thelid 103′. The lower retention channels are thus defined at the interface between thewindow 118 and the flange 119. Theupper channels 120 are defined at the interface between theupper edge 121 of thelower housing 102′ and thebody 122 of thelid 103′. - In prior peristaltic pump designs, fitting are required to engage the transport tube(s) to hold them in position within the housing while the rollers apply pressure to the tube(s). While these fittings are adept at holding the tube position they inherently increase the risk of leakage. In addition, the fitting-to-tube interface becomes a collection point for debris entrained within the fluid flow. Consequently, while conventional peristaltic pumps are well-suited to moving “dirty” fluids, they are susceptible to becoming clogged, particularly on the suction side of the transport tube. The clogs also increase the risk of fluid leak at the fitting. Consequently, in the pump assemblies disclosed herein, no fittings are required due to the configuration of the
tube retention channels FIG. 7 thelower housing 102′ defines aretention tooth 112 flanked by a pair ofrecesses 113. Thelid 103′ defines arecess 116 flanked by a pair ofteeth 115. The recesses and teeth are alternating or complementary meaning that thetooth 112 directly opposes therecess 116, and therecesses 113 directly oppose theupper teeth 115. Theteeth corresponding retention channel tube 64 at the retention channel so that the tube bows slightly upward into theupper recess 116 and downward slightly into the lower recesses 113. This configuration prevents the tube from crawling out of the pump housing under the rotating pressure of the rollers. - It is contemplated that the components of the peristaltic pumps and pump mechanisms disclosed herein are formed of materials suitable for fluid transport. For instance, the components forming the carriages in the different embodiments, namely the gears, support ribs and support plates, can be formed of a suitable plastic. The rollers may be of conventional design and formed of a hard plastic or rubber material.
- It will be appreciated that various of the above disclosed and other features and functions, or alternatives thereof, may be desirably combined into many other different systems or applications. Various presently unforeseen or unanticipated alternatives, modifications, variations, or improvements therein may be subsequently made by those skilled in the art which are also intended to be encompassed by the following claims.
Claims (20)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/434,066 US8292604B2 (en) | 2009-05-01 | 2009-05-01 | Peristaltic pump |
JP2010101632A JP5427687B2 (en) | 2009-05-01 | 2010-04-27 | Peristaltic pump |
CN201010175232.2A CN101876311B (en) | 2009-05-01 | 2010-04-30 | Peristaltic pump |
KR1020100040630A KR101573193B1 (en) | 2009-05-01 | 2010-04-30 | Peristaltic pump mechanism and peristaltic pump |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/434,066 US8292604B2 (en) | 2009-05-01 | 2009-05-01 | Peristaltic pump |
Publications (2)
Publication Number | Publication Date |
---|---|
US20100278667A1 true US20100278667A1 (en) | 2010-11-04 |
US8292604B2 US8292604B2 (en) | 2012-10-23 |
Family
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Application Number | Title | Priority Date | Filing Date |
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US12/434,066 Expired - Fee Related US8292604B2 (en) | 2009-05-01 | 2009-05-01 | Peristaltic pump |
Country Status (4)
Country | Link |
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US (1) | US8292604B2 (en) |
JP (1) | JP5427687B2 (en) |
KR (1) | KR101573193B1 (en) |
CN (1) | CN101876311B (en) |
Cited By (8)
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US20120324995A1 (en) * | 2011-06-21 | 2012-12-27 | Delaware Capital Formation, Inc. | System and Method For Product Level Monitoring in A Chemical Dispensing System |
US20170306942A1 (en) * | 2014-10-14 | 2017-10-26 | Curetis Gmbh | Hose pump and device for analysing a chemical or biological sample |
CN108194331A (en) * | 2017-11-26 | 2018-06-22 | 东莞市松研智达工业设计有限公司 | A kind of peristaltic pump based on centrifugal force |
EP3449126A4 (en) * | 2016-04-26 | 2019-11-27 | Orbis Wheels, Inc. | Centerless pump |
US10639409B2 (en) | 2016-08-11 | 2020-05-05 | B. Braun Avitum Ag | Peristaltic pump comprising modular casing |
US10928236B2 (en) | 2014-07-25 | 2021-02-23 | Hoffmann-La Roche Inc. | Dosing a fluid at a volume of less than one milliliter |
WO2021204676A1 (en) * | 2020-04-06 | 2021-10-14 | Société des Produits Nestlé S.A. | Peristaltic pump |
DE102020121604A1 (en) | 2020-07-08 | 2022-01-13 | Beatrice Saier | Peristaltic pump with planetary gear |
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CN106121978A (en) * | 2014-10-30 | 2016-11-16 | 湖南轻创科技有限公司 | There is the peristaltic pump of rotary wave producer |
CN108496005B (en) * | 2016-01-25 | 2021-07-02 | 弗卢森塞有限公司 | Micro-dose peristaltic pump for micro-dosed fluids |
JP2018071495A (en) * | 2016-11-02 | 2018-05-10 | サントリーホールディングス株式会社 | Pump mechanism and beverage dispenser |
CN108194330B (en) * | 2017-11-26 | 2019-12-24 | 江苏南京白马现代农业高新技术产业园有限公司 | Peristaltic pump based on bevel gear cooperation |
CN108194333B (en) * | 2017-12-08 | 2019-12-24 | 江苏南京白马现代农业高新技术产业园有限公司 | Peristaltic pump for eliminating pulsation by utilizing protrusions |
CN108194334B (en) * | 2017-12-11 | 2020-06-23 | 温州焕宏纺织品有限公司 | Peristaltic pump based on rotatable wheel tire |
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US20120324995A1 (en) * | 2011-06-21 | 2012-12-27 | Delaware Capital Formation, Inc. | System and Method For Product Level Monitoring in A Chemical Dispensing System |
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US10928236B2 (en) | 2014-07-25 | 2021-02-23 | Hoffmann-La Roche Inc. | Dosing a fluid at a volume of less than one milliliter |
US20170306942A1 (en) * | 2014-10-14 | 2017-10-26 | Curetis Gmbh | Hose pump and device for analysing a chemical or biological sample |
EP3449126A4 (en) * | 2016-04-26 | 2019-11-27 | Orbis Wheels, Inc. | Centerless pump |
US10639409B2 (en) | 2016-08-11 | 2020-05-05 | B. Braun Avitum Ag | Peristaltic pump comprising modular casing |
CN108194331A (en) * | 2017-11-26 | 2018-06-22 | 东莞市松研智达工业设计有限公司 | A kind of peristaltic pump based on centrifugal force |
WO2021204676A1 (en) * | 2020-04-06 | 2021-10-14 | Société des Produits Nestlé S.A. | Peristaltic pump |
DE102020121604A1 (en) | 2020-07-08 | 2022-01-13 | Beatrice Saier | Peristaltic pump with planetary gear |
Also Published As
Publication number | Publication date |
---|---|
KR20100119724A (en) | 2010-11-10 |
CN101876311B (en) | 2014-11-05 |
US8292604B2 (en) | 2012-10-23 |
JP5427687B2 (en) | 2014-02-26 |
CN101876311A (en) | 2010-11-03 |
KR101573193B1 (en) | 2015-12-11 |
JP2010261448A (en) | 2010-11-18 |
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